色甘酸钠对沙土鼠前脑缺血再灌注损伤的影响

目的 探讨色甘酸钠对沙土鼠前脑缺血再灌注损伤的影响.方法 健康清洁级雄性蒙古沙土鼠24只,体重55～70 g,随机分为3组(n=8):假手术组(SH组)、缺血再灌注组(M组)及缺血再灌注+色甘酸钠组(CS组).分离双侧颈总动脉,夹闭10 min后恢复血流2 h,建立前脑缺血再灌注模型.SH组仅游离双侧颈总动脉,但不阻断脑血流;CS组于再灌注即刻和再灌注1 h时,分别经舌静脉注射色甘酸钠25 mg/kg(生理盐水稀释为25 mg/ml);M组给予等容量生理盐水.再灌注2 h时处死大鼠,取脑组织,光镜下观察病理学结果,并进行病理学评分;测定脑组织水、丙二醛(MDA)及组胺含量、超氧化物歧化酶(SOD)活性.结果 与SH组比较,M组病理学评分、脑组织水、MDA及组胺含量升高,SOD活性降低(P＜0.05或0.01);与M组比较,CS组病理学评分、脑组织水、MDA及组胺含量降低,SOD活性升高(P＜0.05或0.01).结论 色甘酸钠可减轻沙土鼠前脑缺血再灌注损伤,其机制可能与减少组胺释放和减轻氧化应激反应有关.

Effects of cromolyn sodium on forebrain ischemia-reperfusion injury in gerbils

Objective To investigate the effects of cromolyn sodium(CS)on forebrain ischemiareperfusion injury in gerbils.Methods Twenty-four male gerbils weishing 55-70 g were randomly divided into 3 groups(n=8 each):group Ⅰ sham operation;groupⅡ I/R and group Ⅲ CS 50 mg/kg+I/R.Forebrain ischemia was produced by occlusion of bilateral common carotid arteries for 10 min and confirmed by isoelectricity of EEG. CS was injected via lingual vein at 0 and 1 h of reperfusion.All the animals were killed at 2 h of reperfusion for determination of cerebral cortex injury score,cerebral water content[(wet weight-dry weight)/wet weight×100%],cerebral MDA content,SOD activity and histamine content.Results The cerebral cortex injury 8core,cerebral water content, MDA content and histamine content were significantly increased while SOD activity was signiiieantly decreased in I/R group(Ⅱ)aa compared with sham operation group(Ⅰ)(P＜0.05 or 0.01).CS significantly attenuated the I/R-induced changes(P＜0.05 or 0.01).Conclusion CS can attenuate the forebrain ischemia-reperfusion injury by reducing histamine and oxidative response.